In fact, decades of research show how well it clears breakouts, softens fine lines, fades dark marks and refines texture
Y Honda, T Kessoku, Y Sumida, et al
Curr Opin Physiol 12:3943
This includes asking about dosage, number of injections, how often he needs to do them and what to expect as results
[PubMed ID: 9862645]
Lastly, it is important to note that while glutathione is used for its potential skin-lightening effects, the safety and efficacy of this off-label use have not been established, and it may interact with other skin-lightening agents or products